Abstract:
A moving picture decoding method according to the present invention includes: performing intra prediction on a target block to calculate values of predicted samples of the target block (S403); and calculating reconstructed samples of the target block by adding difference data and the values of the predicted samples of the target block (S404), wherein in the performing of intra prediction, validity of each of reference samples that are located one of immediately above and immediately to the left of the target block is determined, and when the reference samples include both a valid reference sample and an invalid reference sample, the intra prediction is performed using the valid reference sample, and an intra-predicted reference sample is determined as a valid reference sample, and an inter-predicted reference sample is determined as an invalid reference sample.
Abstract:
An image decoding method which can improve both image quality and coding efficiency is an image decoding method for decoding a coded stream which includes a plurality of processing units and a header for the processing units, the coded stream being generated by coding a moving picture, the processing units including at least one processing unit layered to be split into a plurality of smaller processing units, the image decoding method including specifying a hierarchical layer having a processing unit in which a parameter necessary for decoding is stored, by parsing hierarchy depth information stored in the header (S101), and decoding the processing unit using the parameter stored in the processing unit located at the specified hierarchical layer (S102).
Abstract:
An image coding method includes: deriving a candidate for a motion vector predictor from a neighboring motion vector (S1201); adding the candidate to a list (S1202); selecting a motion vector predictor from the list; coding a current block (S1203); and coding a current motion vector (S1204). In the deriving (S1201), the candidate is derived according to a first derivation scheme when each of a current reference picture and a neighboring reference picture is determined to be a long-term reference picture, and the candidate is derived according to a second derivation scheme when each of a current reference picture and a neighboring reference picture is determined to be a short-term reference picture.
Abstract:
A video encoding method using a plurality of reference pictures includes: selecting (300) whether or not a resilient picture referencing scheme is to be used for encoding video; writing (302) a parameter indicating the selection into a header of an encoded video bitstream; and encoding (304) a picture using inter-picture prediction using a result of the selection.
Abstract:
A method of encoding a video into a coded video bitstream with temporal motion vector prediction comprises: determining a value of a flag for indicating whether temporal motion vector prediction is used or not used for the inter-picture prediction of a sub-picture unit of a picture; and writing the flag having the value into a header of the sub-picture unit or a header of the picture; wherein if the flag indicates that temporal motion vector prediction is used, the method further comprises: creating a first list of motion vector predictors comprising a plurality of motion vector predictors including at least one temporal motion vector predictor derived from at least one motion vector from a collocated reference picture; selecting a motion vector predictor out of the first list; and writing a first parameter into the coded video bitstream for indicating the selected motion vector predictor out of the first list.
Title translation:BILDCODIERUNGSVERFAHREN,BILDDECODIERUNGSVERFAHREN,BILDCODIERUNGSVORRICHTUNG,BILDDECODIERUNGSVORRICHTUNG UND BILDCODIERUNGS - / - DECODIERUNGSVORRICHTUNG
Abstract:
A method of performing motion vector prediction for a current block in a picture is provided which includes: deriving a candidate for a motion vector predictor to code a current motion vector of the current block, from a first motion vector of a first block that is spatially adjacent or temporally adjacent to the current block; adding the derived candidate to a list of candidates; and deriving at least one motion vector predictor based on a selected candidate from the list of candidates, wherein the deriving of the candidate includes determining whether to derive the candidate from the first motion vector, based on a type of a current reference picture and a type of a first reference picture, the current reference picture being referred to from the current block using the current motion vector, the first reference picture being referred to from the first block using the first motion vector.
Abstract:
An image coding method includes: deriving a candidate for a motion vector of a current block from a co-located motion vector (S1301); adding the candidate to a list (S1302); selecting the motion vector of the current block from the list (S1303); and coding the current block (S1304), wherein the deriving (S1301) includes: deriving the candidate by a first derivation scheme in the case of determining that each of a current reference picture and a co-located reference picture is a long-term reference picture; and deriving the candidate by a second derivation scheme in the case of determining that each of the current reference picture and the co-located reference picture is a short-term reference picture.